Even long before Sputnik or the space race, a lot of people were very concerned about the proliferation of nuclear weapons. By late August 1949, the Soviets had detonated their own atomic weapon with some kind of complicated role played by espionage. Soon you need, it was felt that one, that each country needed not just more weapons of greater explosive power but also different means of making nuclear reactions release lots of energy. And that is just a kind of drumbeat, kind of terrifying drumbeat of activity from the late 40s right through really much of the 1950s.

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